主页
学科
搜索
账户
常见问题
当前学科：木材
题目：
问答题
木材具有各向异性的原因是什么？试从木材的干缩、渗透及力学强度三个方面说明木材的各向异性。
答案：
<查看本题扣1积分>
查看答案
答案不对？请尝试站内搜索
推荐知识点:
用酸度计测定溶液的PH值时，一般选用（）为指示电极。
压力容器一共有七个环节必须严格执行《压力容器安全技术监察规程》的规定，它们是设计、制造、（）、检验、修理和改造。
风暴潮与海啸的异同？
行政责任的承担方式包括行政处罚和（）。
化学除盐的原理是什么？
Good Table Manners Manners play an important part in making a favorable impression at the dinner table. Here are some general rules： Napkin （餐巾） use The meal begins when the host unfolds his or her napkin. This is your signal to do the same， so place your napkin on your lap. Unfold it completely if it is a small napkin. Or in half， lengthwise （纵向地） ，if it is a large dinner napkin. If you need to leave the table during the meal， place your napkin on your chair as a signal to your server that you will be returning. Once the meal is over， place your napkin neatly on the table to the right of your dinner plate. Do not refold it. Use a napkin only for your mouth. Never use it for your nose， face or forehead. Use of utensils （餐具） Start with the knife， fork or spoon furthest from your plate， and work your way in， using one utensil for each course. If soup is served， remember to spoon away from yourself. This helps stop the drips. Do not put the entire soup spoon in your mouth. Instead， fill a soup spoon about 75 per cent with soup， and sip（啜饮）it from the side noiselessly. After finishing dinner， place the knife and fork parallel to one another across the plate with the knife blade facing inward toward the plate. Using your fingers Here's a list of finger foods： sandwiches， cookies， small fruits or berries with stems， French fries and potato chips， and hamburgers. Chew（咀嚼）with your mouth closed and don't make noise； don't talk with your mouth full. Bread must be broken with your hands. It is never cut with a knife. Don't pick something Out of your teeth. Instead， excuse yourself to the bathroom. If possible， try not to cough at the table. Do not put your elbows （肘） on the table. In France， it is essential to have both hands above the table at the same time. Do not put bones or anything else on the table. Things that are not eaten should be put on your plate. The napkin is used only for（）.
不能被125I碘化的氨基酸残基是（）
对版的内容之所以要进行配置，原因具体来说有（）。
根据各产业对资本、劳动和技术的不同依赖程度，将其划分为（）
盘车